Power valve-gear.



- E. 13'. ROBINSON.

y POWER VALVE GEAR. A/PPL'IOATION FILED MAY 9, 1913.

1,126,657 Patented Jan.2 6,1915.

f." Zblall 'idiom-it lmay concern.'

. @Beit knownthat I, EDWARD P. ROBIN- soma citizen of the United States,residing in .HaldeiL in the county of Middlesex and State ofMassachusetts, have invented an lyIimprovement in .Power Valve-Gear, ofwhich .the following description, in connecioni;\\'itllitheaccoiiipanyiiig drawings, is a ciication, like letters on thedrawings I:representing like parts.

.,Thevpresent inventvon relates toy apower Q10-f that kind which isvoperated by floating wlevers, the cylinder which supplies thev powerto'operate the gear being'c'ontrolled by a valv-e which is primarilyactuated by a' `manually operated' lever, and secondarily 'cp'eratedbyan interconnecting mechanism Y between the valve and the gear which isbeing operated,sothat .the said valve -is au tomatically .shifted whenthe gear has reached a position corresponding to the po 1 .sition 'ofthe manually controlled valve acing lever mechanism for the valve with apositive. locking device which holds the gear.

tuatr g device.

It is' the purpose of the present invention y to provide such a gearwith means for holding the gear in'intermediate positions, and this-isaccomplished by combining the float in position after it ,has been movedby the piston to the position desired. This fasten- 1 ing, device may beautomatic in its release,y operation. so that it releases itself as soonas it lis desired to make a change in runxining conditions, it beingpracticable to {utilize a latching pawl to serve the purpose.

Figure 1 is an elevation, partly in section,`

of a valve gear embodying 'the invention;

- j 401 Fig.2 is a -similarfview showing the parts in a differentposition; and Fig. 3 is a partial elevation taken at a right angle tothe plane of Fig. 1. g .The motor fcr'the valve gear is`,sliown as -aCylinder 1 having a piston 2, lthe pistonp "rod-3 of which is connectedby a connecting rod 'i with an elbow lever or bell crank 5 having a rod6 by which isactuated the link f motion o rfu'ctherreversing gear notshown. In the construction shown, the elbow lever consists of` twooffset arms mounted on a rock-shaft 5a, as shown in Fig. 3. This el` bowlever is operated by steam or compressed air. and the movement of thepiston 2 in one direction .or the other -is-co'iitrolled by a D valve 7of the usual aflve gear, and is enibbdied in a valve gear ly l N l' lSTATESPATENT OFF noiaiivson, ordiuALDEiN, .im:assnoHusa'iris.l i

*i i i'mwiiia.vAI'zV'E4-irrita.v I I 'l `Sp.education of Letters Patent.I l Patented Jan. v 26,1915 application aieanaye, i913. seriaimzealisa.y A

construction. The operating rod 8 for the said1 D valve, which rodlpasses through a' suitable stuffing box, is connected with an whichwill be hereinafter referred to as the reversing lever. The other end ofthe'lever 9 is connected by means of a rod 13 with'a part of the elbowlever 5, said rod being herein shown as connected with thel wristpin 14.This is substantially the samev as the floating lever construction nowcommonly employed, the movement of the 'reversing Vhaust port at theother end thereof. The

position of the end of the lever 9 to which i the rod -10 is connectedis determined by the position of the reversing lever 12, and as theelbow lever 5 moves inresponse to the movelever 12 when the valve gearis stationary, v

ment of the piston 2, the rod 13 rocks the lever- 9, on the end of therod 10 as a pivot,

thereby automatically closing the valve `7 without further movement ofthe reversing lever l2.

In accordance with the invention, the apeasily put in operation to holdthe reversing gearinI any position of cut oil", the said deso thattheparts are released whenthe revice being automatic in its i' nlockingaction,

versing lever is operated, tol cause a movement of the piston from theposition in which-it is being held. In the construction shown` pawls 15are employed `for this purpose, there being two of such pawls, one of'which is adapted to hold the parts in posi-l tion when the engine isreversed and linked up, and the other to hold the parts when the engineis running ahead and linked up. These pawls are shown as mounted onpivots 16 and provided with weighted ends 17, so that they naturallyfall to the position shown in Fig. l, being rocked on the said pivots,however, by means of lan actuating handle `18. These pawls coperate,respectiifely, with sets of teeth-19 and 20, connected with or formed onthe connecting rod 4 through which the piston 2 operates.

Assuming, for example, that the engine is running full speed ahead, withthe parts in the position shown in Fig. 1, and it -is deor, 1n othervclosing said reversmg valve; of la mechanisired to link up the engine,words, provide for an earlier cut-off, the reversing lever 12 is movedon its pivot'lgafw'" from-the stop 21, thus moving the valve downward,and admitting pressure to the upper end of the cylinder 1, causing adownward movement of thev'piston. Thismove.- ment is communicated totheelbow lever and the reversing mechanism' brings about the closure of thevalv-e 7 through the action end of the cylinder,

- pressure to of the lever 9 inthe usual way. The upper awl 15 is thenmoved, through the agency of the lever 18, so that it is in position toengage 2, the D valve 7 then being in its neutral position with bothports closed. The reversing lever 12 is then moved back to its originalfull speed ahead position, thus-producing an .upward movementof the rod10 which throws the D valve open to the lower thus admitting pressure tothe under side of the piston 2, so that the latter. pulls upwardvagainst the pawlv 15, holding the said pawl locked, owing to the actionofthe full pressure on the piston 2 in one direction, and the mechanicalresistance -oi thepawl 15 in the other direction. With the parts in thisposition, the pawl 15 will be at once released when the reversing lever12 is thrown over, as such movement will reverse the slide valve 7,admitting the top of the piston 2, the pawl releasing itself through theaction. of the weight 17, as soon as the rod l begins to move awayreversed. .the reversing coilnpletely over to the stop 22, and the va vevof the piston until the valve 1s restored to the middle position shownlin Fig. 1 through the action of the lever '9 and its connections.

.with one 'of the teeth If'it is.desired to link up the engine when thusreversed, the reversing lever 12 is moved thedesired distance away fromthe stop 22, thus admitting pressure to the un- -der side of the piston2 until the desired movement has takeny place, after which the lowerpawl15 mayv be operated by the lever 18, and will be engaged, asabovedescribed, or notches 2O where it will be held by the reversingaction which is lcaused by restoring the reversing lever 12 to its fullspeed astern position, viz'., in contact with the stop 22.

' What I claim-is:

1.1In 'a pressure operated reversing gear,4

one of the -teeth 19, as shownin Fig.

from it. If the engine is to belever12 is thrown 7 will then remain initslowermost position with pressure'owing to the top thefcombination:with a motor` having a rver'smg valve and means for automatically calholding device adapted to hold the Said reversing gear in intermediate.,positions;' means for manually operatingsaid holding deviceto -move itto its holding position; and means whereby .said'holding device isv'automatically released when the motor is re- .valveis automaticallycontrolled by the piston movement; a locking devicefor' holdingthepiston in intermediate positions when the` valve 1s open; and meanswhereby=the pressure on the piston causes said lorlkmg device to remainin locking osition.

3. .In a pressure operated reversingj/gear,

a cylinder; a piston therein connected/' with the reversing gear; avalve controllii'g the admission of vpressureto said cylinderll; -areversing lever to operate said valve;'e.f1ualiz ing connectingmechanism betweeiI said valve and said reversing gear, whereoyrsaidvalve isV automatically controlled by-the piston movement; and means-wherela'yl said locking device is held locked by pressure on the pistonin one' direction and alitomatically released by pressure on theli-)iston in the other direction.

'41. In a pressure operated reversir'ig gear, .a cylinder; ya pistontherein connected with the reversing gear; a valve controlling theadmission of pressure versing lever to operate said `ing connectingmechanism bgtween said' valve and said reversing gezin-@jy 'fereby vsaidvalve is automatically control, ed by the movement of thepiston-oppositely disposed teeth carrled by thereversing gear; weighted`pawls adapted to engage said teeth when the gear is in ,linked-upposition for 'ahead or reverse; and

M. E.` CovENEY.

means for man- ,ually moving said pawls into locking posi-

